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Traitorous fish throw friends to the wolves

作者:宓龙姿    发布时间:2018-02-21 01:00:23    

IF YOU’RE being chased by a bear, having a friend alongside is a good idea: trip them up, and you can flee. You’re probably too decent to do that, but a little South American fish, the two-spot astyanax, has no such qualms. These fish sometimes swim into hydroelectric plants, damaging machinery. While seeking ways to deter them, Robert Young of the University of Salford, UK, observed that when a predator confronts a group of astyanax, they bite one of their number – making it a tempting target (Animal Behaviour, doi.org/m6j). Young reckons the fish adopt this strategy because they live in small groups, giving individuals an incentive to be selfish. This article appeared in print under the headline “Fish throw friends to the wolves” More on these topics:

 

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